SessionHandler::read

(PHP 5 >= 5.4.0, PHP 7)

SessionHandler::read — Read session data

说明

publicstringSessionHandler::read
( string$session_id
)

Reads the session data from the session storage, and returns the result back to PHP for internal processing.
This method is called automatically by PHP when a session is started (either automatically or explicity
with session_start() and is preceeded by an internal call to the
SessionHandler::open().

If this class is extended by inheritiance, calling the parent read method will invoke the
wrapper for this method and therefor invoke the associated internal callback. This allows the method to be
overidden and or intercepted and filtered (for example, decrypting $data value
returned by the parent read method).